Question

two trains A and B approaching a platform from opposite direction. the siren in the station is making a sound at frequency 4 the passenger in train A and B hear it with frequencies 4.5 and 5 then velocities of A and B​

Answer 1

$v_{Ao}=42.875\ m.s^{-1}$ is the velocity of train A

$v_{Bo}=85.75\ m.s^{-1}$ is the velocity of train B

Explanation:

Given:

• original frequency of sound from source, $f_s=4\ Hz$

• frequency observed from train A, $f_{Ao}=4.5\ Hz$

• frequency observed from train B, $f_{Bo}=5\ Hz$

We have;

• the speed of sound in air,$s=343\ m.s^{-1}$

Now, by the mathematical expression of Doppler effect:

For train A:

$\frac{f_{Ao}}{f_s} =\frac{S-v_A_o}{S}$

$\frac{4.5}{4} =\frac{343+v_A_o}{343}$

$v_{Ao}=42.875\ m.s^{-1}$

For train B:

$\frac{f_{Bo}}{f_s} =\frac{S-v_B_o}{S}$

$\frac{5}{4} =\frac{343+v_B_o}{343}$

$v_{Bo}=85.75\ m.s^{-1}$

TOPICS: Doppler effect of sound

#LearnMore

https://brainly.in/question/7055231